Portable air purifier



FIG. 1 illustrates a front perspective view of a portable air purifier showing our new design;

FIG. 2 illustrates a front elevational view thereof;

FIG. 3 illustrates a rear elevational view thereof;

FIG. 4 illustrates a left side elevational view thereof;

FIG. 5 illustrates a right side elevational view thereof;

FIG. 6 illustrates a top plan view thereof; and,

FIG. 7 illustrates a bottom plan view thereof.

The broken lines in the figures show portions of the portable air purifier that form no part of the claimed design. 

CLAIM The ornamental design for a portable air purifier, as shown and described. 